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Derivative and Hedging Instruments - Balances in Cash Flow Hedge Reserve (Details) - Cash flow hedges - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about hedging instruments [line items]    
Balances in the cash flow hedge reserve for continuing hedges $ 10 $ (149)
Balances remaining in the cash flow hedge reserve on de-designated hedges 0 0
Total $ 10 $ (149)